Holding means for the removable jaw of a slidable outer jaw wrench



June 5, 1956 M. CALELLO 2,748,641

' HOLDING MEANS FOR THE REMOVABLE JAW OF A SLIDABLE OUTER JAW WRENCH Filed NOV. 4, 1954 IN V EN TOR.

United States Patent HOLDING MEANS FOR THE REMOVABLE JAW OF A SLIDABLE OUTER JAW WRENCH Mario Calello, Dedham, Mass., assignor to St. Pierre Chain Corporation, Worcester, Mass., a corporation of Massachusetts Application November 4, 1954, Serial No. 466,710

Claims. (Cl. 81180) This invention relates to a new and improved wrench having a removable jaw construction embodying relatively quick and easy means for applying the removable jaw and replacing the same, and the construction in the present case is intended to replace conventional jaw-holding rivets and the like which are very diflicult to remove and which in the removal thereof are liable to injure the material of the Wrench adjacent the rivet, particularly where alumimm is used as the base material for the wrench.

The main object of the present invention resides in the provision of quick and easy removable means as recited above for holding a removable jaw for a wrench firmly in position; the provision of a wrench as above stated including a recessed jaw face on the wrench body bounded by a pair of upstanding abutments, the removable jaw having a portion for insertion into said recess, said insertable portion being provided with a through hole or the like and said abutments being provided with threaded apertures for the reception of screws or Allen fasteners or similar fastening means, one at each side of the portion of the jaw received in the recess, said hole and apertures being offset in a direction so that when the fasteners enter the hole in the jaw portion, the latter is in effect cammed downward into very firm locked engagement with the jaw face of the wrench and there is no possible looseness of parts when the removable jaw is assembled, and in addition if looseness occurs after continued use, this looseness may be eliminated by tightening up the fasteners above referred to.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which Fig. 1 is a view in side elevation of a wrench embodying the invention;

Fig. 2 is a view in front elevation on an enlarged scale looking in the direction of arrow 2 in Fig. 1, parts being broken away and in section;

Fig. 3 is a section on line 3-3 of Fig. 2;

Fig. 4 is a section on line 4-4 of Fig. 3; and

Fig. 5 is a view partly in section illustrating the holding action of the fasteners in diagrammatic form.

In carrying out the present invention, the same has been shown as applied to a wrench generally indicated at 16 and having a movable jaw 12 actuated by a nut 14 to approach or move away from a jaw part 16. The part 16 is removable and may be replaced in case of wear. The removable jaw 16 is also used where the wrench is made of aluminum or other light-weight metal, but the jaw itself, being made of steel, must be made-separately and applied thereto by some means such as a rivet in the prior art.

The rivets of the prior art are very difficult to punch out to permit removal and replacement of a worn removable jaw. Such rivets must first be ground off to remove any peened material and then the rivet must be punched out in a press, often distorting the hole in which the rivet is located, injuring the material of the wrench, etc.

The present invention obviates the use of rivets and provides for simple fasteners which may be applied or removed by anyone and which at the same time force the removable jaw 16 into extremely close and immovable relationship with the wrench face portion indicated at 18.

The portion of the wrench indicated at 18 is cut away centrally thereof to form a recess 20. This recess may be of any configuration such as shown in Fig. 3, but-in any event it provides a pair of offset shoulders or abutments 22. The removable jaw 16 is provided with a pair of shoulders 24 and a central depending portion 26 for reception in recess 20, the jaw portion 26 being provided with a lateral through hole 28, each end of which is slightly beveled or countersunk as at 30.

Each of the abutments 22 is provided with an aperture passing therethrough and preferably threaded as indicated in Fig. 2 at 32. These holes receive threaded fasteners as for instance in the nature of Allen head screws as indicated in Fig. 1 at 34. In any event, each screw or fastener is provided with a reduced forward end portion 36, which portion is plain and unthreaded and which joins the threaded portion of the fastener by means of a chamfered shoulder 38 which may more or less" fit the countersink 30 appearing at each side of the hole 28.

The two threaded apertures at 32 are coaxial and extending ends 36 of the fasteners 34 are also coaxial, but when the removable jaw is placed in position on the abutments 22, as shown in Fig. 4, the axis of the hole 28 is slightly above the axis of the two apertures 32 as is plainly indicated by the center lines in Fig. 4. When, therefore, the fasteners are entered into the apertures 32, the forwardly extending ends thereof at 36 will tend to relatively ride up on the countersunk ends 30 of the hole 28 and thus in effect cam the entire removable jaw 16 in a downward direction to firmly and tightly seat it on the shoulders forming the top surfaces of abutments 22 of the face 18.

If after use, the jaw 16 should become slightly loose, it may be tightened up by a very slight turn on the fasteners 34 and the chamfered shoulder 38 will tend to enhance or increase the action, pulling the jaw 16 downwardly, by contact with the countersunk ends 30 of hole 28.

It will be seen that this invention provides a very quick and easy way of securing a removable jaw to a wrench in the first instance, and instantly removing and replacing the same with no damage to the wrench itself and without any special tools required except the tool driver necessary to remove the fasteners, and to re-apply the same as described, and also the jaw may be tightened after use, which is not possible with the rivet construction.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is:

1. The combination with a wrench having a removable jaw, of means to secure, tighten, and provide for replacement or" the removable jaw comprising a removable fas tener associated with the body of the wrench, an extending end on said fastener, said wrench body having a recess into which the fastener end is extendable, an extension on the removable jaw for disposition in the recess, said removable jaw extension having a hole therein for receiving the extending end of the fastener, said hole and fastener end being relatively slightly offset in seated condition of the removable jaw on the wrench, so that the fastener bears on the side of the hole to tend to move the removable jaw into tighter, clamping relation with'the wrench body.

2. The combination with a wrench having a pair of spaced abutments and an intervening recess and a removable jaw including a central portion to enter the recess with lateral portions seated on the abutments, of means to secure the removable jaw to the abutments comprising an aperture in each abutment, the central portion of the removable jaw having a through hole for general alignment thereof with the apertures, a fastener in each aperture, an inwardly extending end on each fastener to enter the hole from opposite ends of the latter, the hole and apertures being offset when the removable jaw is seated, the said extending ends of the fasteners Wedging the jaw down onto the abutments in tightened relation thereto.

3. The combination with a wrench having a pair of spaced abutments and an intervening recess and a removable jaw including a central portion to enter in the recess with lateral portions seated on the abutments, of means to secure the removable jaw to the abutments comprising a threaded aperture in each abutment, said apertures being axially aligned, the central portion of the removable jaw having a through hole for general alignment thereof with the threaded apertures, a fastener in each aperture, an inwardly extending end on each fastener to enter the hole from opposite ends of the latter, the hole and apertures being misaligned when the removable jaw is seated, with the hole spaced farther from the bottom of the recess than the apertures, the said extending ends of the fasteners wedging the jaw down onto the abutments in tightened relation thereto, the sides of the central portion of the jaw being beveled at the ends of the hole to receive the ends of the fasteners in camming relation.

4. The combination of claim 3 wherein the ends of the fasteners are reduced in size and join the main portions thereof by means of a beveled neck to fit the beveled portions of the jaw,

5. A connection construction for securing a recessed part to a part having a central extending portion to seat in the recess comprising a threaded aperture at each side of the recess, a threaded fastener in each aperture, an inwardly extending end on each fastener, the said central portion having a hole therethrough, said fastener ends entering the hole at the ends of the latter, said hole and apertures being mis-aligned in seated condition of the parts, the extending fastener ends forcing the parts together in tight relation.

References Cited in the file of this patent UNITED STATES PATENTS 120,910 Stratton Nov. 14, 1871 387,475 Whaling Aug. 7, 1888 525,683 Friede Sept. 4, 1894 657,391 Brosnihan Sept. 4, 1900 1,018,528 Suddarth Feb. 27, 1912 1,075,649 Hill Oct. 14, 1913 1,908,421 Heggem May 9, 1933 

